Caharel Stéphanie, Collet Kevin, Rossion Bruno
Université de Lorraine, Laboratoire de Psychologie de l'interaction et des relations intersubjectives (InterPsy-EA4432), Nancy Cedex, France.
Psychological Sciences Research Institute and Institute of Neuroscience, University of Louvain, Belgium.
Biol Psychol. 2015 Mar;106:18-27. doi: 10.1016/j.biopsycho.2015.01.010. Epub 2015 Jan 22.
Visual representations of faces are extracted shortly after 100 ms in the human brain, leading to an occipito-temporal cortex N170 event-related potential (ERP). To understand the nature of this early visual representation, a full-front adapting face preceded a different or identical target face identity. The target face varied parametrically in head orientation from the adapting face (0-90°, 15° steps). The N170 elicited by the target face increased progressively from 0° up to 30° head orientation, with no further increase until 90°. The N170 decreased for repeated face identities, this effect being stable between 0° and 30° changes of viewpoint, and no effect beyond that angle. These observations suggest that a face is encoded in a view-dependent manner, being matched to either a full-front or a profile face view. Yet, individual face representations activated as early as the peak of the N170 generalize partially across views.
人脸的视觉表征在人类大脑中100毫秒后不久就被提取出来，从而产生枕颞叶皮质N170事件相关电位（ERP）。为了理解这种早期视觉表征的本质，一个正脸适应面孔先于一个不同或相同的目标面孔身份出现。目标面孔相对于适应面孔在头部朝向方面呈参数化变化（0-90°，步长为15°）。目标面孔引发的N170从0°到30°头部朝向逐渐增加，直到90°才不再增加。对于重复的面孔身份，N170会降低，这种效应在0°到30°的视角变化之间是稳定的，超过该角度则没有影响。这些观察结果表明，面孔是以视角依赖的方式进行编码的，与正脸或侧脸视图相匹配。然而，早在N170峰值时就被激活的个体面孔表征会在一定程度上跨视角泛化。
